/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package core.api.a3;

import api.a1.Context;
import api.a1.ExecutableRunner;
import api.a1.RequestContext;
import api.kiecontainer.Command;
import api.kieservices.BatchExecutionCommand;
import core.api.a1.Batch;
import core.api.a1.RegistryContext;
import core.impl.p3.ExecutionResultImpl;
import core.impl.p7.BatchImpl;

import java.util.List;

import static java.util.Collections.singletonList;

public interface InternalLocalRunner extends ExecutableRunner<RequestContext> {
    default RequestContext execute(api.a2.Executable executable) {
        return execute( executable, createContext() );
    }

    default <T> T execute(Command<T> command) {
        Context ctx = execute( new SingleCommandExecutable( command ) );
        return command instanceof BatchExecutionCommand ?
               (T) ( (RegistryContext) ctx ).lookup( ExecutionResultImpl.class ) :
               (T) ( (RequestContext) ctx ).getResult();
    }

    default <T> T execute(Command<T> command, Context ctx) {
        execute( new SingleCommandExecutable( command ), (RequestContext) ctx );
        return command instanceof BatchExecutionCommand ?
               (T) ( (RegistryContext) ctx ).lookup( ExecutionResultImpl.class ) :
               (T) ( (RequestContext) ctx ).getResult();
    }

    class SingleBatchExecutable implements InternalExecutable {
        private final Batch batch;

        public SingleBatchExecutable( Batch batch ) {
            this.batch = batch;
        }

        @Override
        public List<Batch> getBatches() {
            return singletonList( batch );
        }
    }

    class SingleCommandExecutable extends SingleBatchExecutable {

        public SingleCommandExecutable( Command command ) {
            super(new BatchImpl().addCommand( command ) );
        }
    }
}
